---
- on_error
- on_finish
- on_message_start
- on_message_complete
- on_request
- on_response
- on_reset
- on_method
- on_url
- on_protocol
- on_version
- on_status
- on_reason
- on_header_name
- on_header_value
- on_headers
- on_connect
- on_upgrade
- on_chunk_length
- on_chunk_extension_name
- on_chunk_extension_value
- on_chunk
- on_body
- on_data
- on_trailer_name
- on_trailer_value
- on_trailers
- on_state_change
